test/std/algorithms/algorithms.results/no_unique_address.compile.pass.cpp

//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

// UNSUPPORTED: c++03, c++11, c++14, c++17

// clang-cl and cl currently don't support [[no_unique_address]]
// XFAIL: msvc

// [algorithms.results]/1
//   Each of the class templates specified in this subclause has the template parameters,
//   data members, and special members specified below, and has no base classes or members
//   other than those specified.

#include <algorithm>

#include "test_macros.h"

struct Empty {};
struct Empty2 {};

static_assert(sizeof(std::ranges::in_fun_result<Empty, int>) == sizeof(int));
static_assert(sizeof(std::ranges::in_fun_result<int, Empty>) == sizeof(int));
static_assert(sizeof(std::ranges::in_fun_result<Empty, Empty>) == 2);

static_assert(sizeof(std::ranges::in_in_result<Empty, int>) == sizeof(int));
static_assert(sizeof(std::ranges::in_in_result<int, Empty>) == sizeof(int));
static_assert(sizeof(std::ranges::in_in_result<Empty, Empty>) == 2);

static_assert(sizeof(std::ranges::in_out_result<Empty, int>) == sizeof(int));
static_assert(sizeof(std::ranges::in_out_result<int, Empty>) == sizeof(int));
static_assert(sizeof(std::ranges::in_out_result<Empty, Empty2>) == sizeof(char));

static_assert(sizeof(std::ranges::in_in_out_result<Empty, int, int>) == 2 * sizeof(int));
static_assert(sizeof(std::ranges::in_in_out_result<int, Empty, int>) == 2 * sizeof(int));
static_assert(sizeof(std::ranges::in_in_out_result<int, int, Empty>) == 2 * sizeof(int));
static_assert(sizeof(std::ranges::in_in_out_result<char, Empty, Empty>) == 2);
static_assert(sizeof(std::ranges::in_in_out_result<Empty, char, Empty>) == 2);
static_assert(sizeof(std::ranges::in_in_out_result<Empty, Empty, char>) == 2);
static_assert(sizeof(std::ranges::in_in_out_result<int, Empty, Empty2>) == sizeof(int));
static_assert(sizeof(std::ranges::in_in_out_result<Empty, Empty, Empty>) == 3);

static_assert(sizeof(std::ranges::in_out_out_result<Empty, int, int>) == 2 * sizeof(int));
static_assert(sizeof(std::ranges::in_out_out_result<int, Empty, int>) == 2 * sizeof(int));
static_assert(sizeof(std::ranges::in_out_out_result<int, int, Empty>) == 2 * sizeof(int));
static_assert(sizeof(std::ranges::in_out_out_result<char, Empty, Empty>) == 2);
static_assert(sizeof(std::ranges::in_out_out_result<Empty, char, Empty>) == 2);
static_assert(sizeof(std::ranges::in_out_out_result<Empty, Empty, char>) == 2);
static_assert(sizeof(std::ranges::in_out_out_result<int, Empty, Empty2>) == sizeof(int));
static_assert(sizeof(std::ranges::in_out_out_result<Empty, Empty, Empty>) == 3);

#if TEST_STD_VER >= 23

static_assert(sizeof(std::ranges::in_value_result<Empty, int>) == sizeof(int));
static_assert(sizeof(std::ranges::in_value_result<int, Empty>) == sizeof(int));
static_assert(sizeof(std::ranges::in_value_result<Empty, Empty2>) == sizeof(Empty2));

#endif // TEST_STD_VER

// In min_max_result both elements have the same type, so they can't have the same address.
// So the only way to test that [[no_unique_address]] is used is to have it in another struct
struct MinMaxNoUniqueAddress {
  int a;
  TEST_NO_UNIQUE_ADDRESS std::ranges::min_max_result<Empty> b;
  int c;
};

static_assert(sizeof(std::ranges::min_max_result<Empty>) == 2);
static_assert(sizeof(MinMaxNoUniqueAddress) == 8);

static_assert(sizeof(std::ranges::in_found_result<Empty>) == sizeof(bool));